Alternating-current-motor-controlling apparatus.



PATENTED APR. 16, 1907.

Y W. N. DIOKINSOMJR. ALTERNATING CURRENT MOTOR CONTROLLING APPARATUS.

APPLICATION FILED J'ULYZO, 1905.

4 SHEETSSHEET l.

PATENTED APR. 16, 1907.

W. N. DICKINSON, JR. ALTERNATING CURRENT MOTOR CONTROLLING APPARATUS.

APPLICATION FILED JULYZO, 1905.

4 SHEETSSHEET 2.

No 850,630. PATENTED APR. 16, 1907.

' W. N. DICKINSON, JR. v

ALTERNATING CURRENT MOTOR CONTROLLING APPARATUS.

APPLICATION FILED JULYZO, 1905.

4 SHEETSSHEET 3.

No. 850,630. PATENTED APR. 16, 190v.

W. N. DICKINSON, JR. ALTERNATING CURRENT MOTOR CONTROLLING APPARATUS.

APPLICATION FILED JULYZO, 1905.

4 SHEETSSHEET 4.

i-Jnvgnl'oa qvitnmw v w v I thereof.

UNITED STATES PATENT OFFICE.

WILLIAM N. DICKINSON JR., OF BROOKLYN, NEW YORK, ASSIGNOR' TO OTISELEVATOR COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORA- TION OF NEWJERSEY. I

ALTERNATlNG-CURRENT-MOTOR-CONTROLLING APPARATUS.

Specification of Letters Patent.

Patented April 16, 1907.

Application filed July 20, 1905- Serial No. 270.460.

To (all w/wm it may concern;

Be it known that 1, WILLIAM N. DICKIN- soN, Jr., a citizen of the UnitedStates, residing at Brooklyn, in the county of Kings and State of NewYork, have invented a new and useful Improvement in Alternating-Current-Motor-Oontrolling Apparatus, of which the following is a specification.

My invention relates to means for controlling alternating-cirrrentmotors, and has for its object the provision of improved and ellicientmeans for automatically controlling the operation of alternating-currentmotors.

A further object of my invention is to provide mechanism for controllingthe circuits to the motor such that chattering of the parts, due to thealternating current, shall be reduced to a minimum.

To these and other ends appearing hereinafter my invention consists,substantially, of the construction, combination, location, and relativearrangement of parts, all as more fully set forth in the followingdescription, as shown in the drawings accompanying the specification,and finally pointed out in the appended claims. I

Referring to the drawings, Figure 1 represents diagrammatically andpartly in plan a system of motor control with my invention includedtherein. Fig. 2 shows the wiring of the quarter-phase reversing-switchmagnets. Fig. 3 isa sectional and elevational detail view of thecontroller-board shown in circular form in Fig. 1. Fig. 4 showsdiagrammatically and partly in elevation my invention applied to anelevator system. Fig. 5 shows meansfor restoring the elements of thecontroller-board to normal position. Fig. 6 is a modification of Fig. 5.Fig. 7 shows a modification of the construction shown in Fig. 3. Figs. 8and 13 are additional modifications Fig. 9 shows in detail theconstruction of a repulsion-magnet used on the controller-board inFig. 1. Fig. 10 shows an antifriction-roller adapted to be engaged by arestoring-cam. Fig. 11 shows means for adjusting thecontrollercircuit-closing mechanism, and Fig. 12 shows my inventionapplied to a single-push utton-eontrolled electrio-elevator systememploying an alternating current to drive the hoisting mechanism.

In Fig. 1 the numeral '1 designates an alternating-current motor havinga rotor 2, to

the shaft of which is secured a brake-pulley 14. 3 and 4 arereversing-switches for the motor, and 5 the main-line switch. 15, 16,and 17 are main lines of a three-wire twophase system ofalternating-current supply. The supply may be two 'phase or threephasecurrent with the system of wiring shown. 6 designates acontrolling-board of insulating material. It is shown in plan in Fig.1,but is intended to be employed in substantially a horizontal position,as shown in Figs. 1 and 4. 15 designates a bank of pushbuttons forcontrolling the operation of the motor in a predetermined manner-ms, forexample, to stop a dumbwaiter or an elevator-car at predetermined pointsin its travel.

The controller-board and its appurtenances will now be described. Theirconstruction is most clearly shown in Fig. 4. To the foundation 1? aresecured the standards 18 and 19, which support the inner disk 7 of thehorizontal controller-board (5. The outer annular part 16 of the boardmay he supported in any suitable manner, but is herein shown as rigidlyconnected with the disk 7 by means of angle-irons 20 and 21. Three ormore brackets, two of which, as 22 and 23, are shown in Fig. 4, aresecured to the under side of the annular piece 16". These brackets serveas supporting means for the cylin drical cam 26, the lower inner ends ofthe brackets fitting in the annular grooves 24 25 on the periphery ofthe cam-cylinder.

The cylinder 26 extends-upwardly through the circular slot 114 in thecontroller-table (i and has a portion of its upper end cut away throughan arc of about one hundred and eighty degrees. The higher'portionextending through this slot operates as a" restoringcam in a mannerhereinafter explained. The lower inner side of the cylinder 26 isprovided with an, annular gear 27, with which meshes a pinion 28. Thispinion is secured to the vertical shaft 29, which is supported in thebearing 38 on the foundation 17 and is prevented from moving laterallyby the bearing 39 at the end of a rod 30, which is fixed to the standard19. To the lower end of the shaft 29 is secured a wormwheel 3 1 whichmeshes with aworm 32 on the end of the motor-armature shaft 33. The wormand worm-wheel and the pinion and and 65.

gear are so proportioned that the cylindrical cam shall move throughabout one hundred and eighty degrees while the motor-armature makes apredetermined number of rev 0- lutions. Also secured to themotor-armature shaft 33 are the brake-pulley 4 and the hoisting-drumworm in the housing 34. The motor 1, brake 37, housing 35 forthewormwheel, hoisting-drum 36, brake-magnet 40, and the brake-applyingspring 41 are all supported on the foundation 17 in the usual manner.The hoisting-cable 42 passes over sheaves 43 44 to the elevator-car 45which is provided with the usual guide-shoes 47'to engage the guides 46.

Inasmuch as it is desirable to stop the car automatically if it shouldrun beyond the limits of its travel, I have provided suitablelimit-switches adjacent the cylindrical cam 26, to be operated therebyto break the mainline circuits. In Fig. 4 two sets of limitswitches,three in each set, are placed substantially diametrically opposite eachother. The limit-switches at the left are designated by thereference-numbers 57, 58, and 59. These switches are suitably pivoted at60, 61, and 62 and are adapted to engage fixed contactblocks 54, 55, and56 at one end and have antifriction insulation-rollers 66, 67, and 68 atthe other ends which engage projections 63, 64, and 65, respectively, onthe periphery of the cylinder 26. The main-line switch 5 connects themain lines 15, 16, and 17 respectively, with branch circuits 48, 49, and50 and with the branch circuits 51, 52, and 53 in parallel.

As shown in Fig. 4, the limit-switches 57, 58, and 59 are held open bythe cams. 63, 64,

These cams are in horizontal alinement with the switch-levers at theright as well as with those at the left, so that when. the cylinder 26has rotated through about one hundred'and eighty degrees from theposition shown the cams will effect the opening of the contacts 69, 70,and 71. This will cause the last-operated reversing-switch to berestored to normal, and consequently the brake-magnet applied to stopthe motor, hoisting mechanism, and car.

For the sake of clearness I have omitted from Fig 4 the push-buttons,controllerboard, and circuits and connections therefor shown in Fig. 1.This is indicated by the dotted lines 72 and 73. It is therefore to beunderstood that when the main-line switch 5 is closed neither of themagnets 74 75 of the reversing switches 3 4 are energized. Let it heassumed, however, that the proper push-button is operated to close thecontacts 76, 77, and 78 of reversing-switch 4. In

. such case circuits would be closed to the tion 16 of thecontroller-table 6.

versing-switch 4, wires 79 80 81, to the motor-terminals 86 87. Aparallel circuitis also established through the quarterphasebrake-magnet 40, whereupon the brake will be released and the motorwill-start. The brake-magnet 40 is shown in this instance as rigidlysupported by the bracket 91, attached to the hoisting mechanismframework. 1 The spring 41 is secured to an extension 92 from thisbracket and normally presses downwardly the connections 94 to the braketo apply the same. At the same time it moves downwardly the frame 95,which is rigidly attached to said connection 94. cured the armature 93of the brake-magnet. It will now be seen that when the cams 63 64 65strike the limit-switches at the right the contacts 69, 70, and 71 willbe opened and that this operation cuts oil thecurrent to the motor andbrake-magnet and causes the motor to stop. Between the limits of travelof the cams 63 64 65 both sets of reversingswitches are closed, so thatthe car may be operated in either direction between its limits oftravel. This does not interfere in any way with the cars normaloperation, as only one reversing-switch can be e erated at a time. It isalso to benoted that a though the limit-switches are held open the carcan again start, as the reversing-switch other than that last operatedmay be closed to automatically move the car in the opposite direction,as is desired.

In Fig. 1 are shown a series of single-phase magnets 9, 10, 11, 12,13,9, 10, 1], 12, and 13, mounted on the annular piece of insula-Coacting with each of these magnets is a circuit-closing lever 96 and atripping device, which are shown in detail in Fig. 3. In each case thelever 96 is pivoted at 98 to the strip 99, which is adjustably attachedto the annulus l6. Near the inner end of the lever 96 are mountedinsulated contacts 100 and 101, which are adapted to engage thearc-shaped contactstrips 102 and 103 or 102 and 103, respectively, whichare fixed to the inner disk 7, as shown in Fig. 1. The outer end 104 ofthe lever 96 engages with the vertical arm 107 of the bell-crank lever97, which is pivotally supported at 105. The horizontal arm 106 of thebell-crank lever extends over the magnet-solenoid 108 and has fixed toit .a horizontal disk 109, of fiber or other insulating material.

In Fig. 9 a sectional view of the magnet illustrates its construction indetail. A spool 110 of insulation, is provided for the solenoid 109, inthe center of which is placed the laminated soft-iron core 113.' Thespool is 6X-. tended upwardly at its central portion, so as to have aneck 111 to guide a ring or an nulus of copper .or other non-magneticmaterial, but a good conductor of electricity.

To the upper side of this frame is se This ring 112 is so constructedthat it shall have a free movement up and down on the neck 111, and isadapted to strike against the disk 109 when projected upwardly. The disk109 has a central opening of sufiicient size to allow free movement ofthe disk- 109 and a certain tilting of the same.

On the under side of the lever 96, directly over the slot 114, issecureda frame 115, carrying an antifriction-roller 116, which is adapted to beengaged by the semicircular cam 8. When the cam 8 is in the positionshown in Fig. 1, the lower five of the levers 96 will be held in theposition shown in Fig. 3that is, the toe 104 of the lever 96 is held outof engagement with the vertical arm 1.07 of the bell-crank lever 97.

Each of the upper five levers 96, however, are in their releasingpositions, and by reason of the inner parts being heavier than the outerparts the toes 104 will be held in frictional engagement with thevertical arms 107. N ow when alternating current is sent through thesolenoid 108 of any magnet the ring 112, loosely carried thereby, willbe suddenly projected upwardly against the disk 109 and tilt thebell-crank lever sufficiently to trip the lever 96, so that its innerend falls by gravity to-bring the contacts 100 and 101 into engagementwith the contact-strips 102 and 103, respectively. It should beparticularly noted that after the magnet has once operated the trippingdevice to bring the circuit-closer to closed position the alternatingcurrent is no longer depended upon to maintain the circuit-closerclosed. This I deem a distinct advantage of my invention, as allchattering due to pulsating attraction is avoided and the circuit-closeris not held in place by a varying force, which tends to produce sparkingor at least uncertain connections. v

In alternatingcurrent push-buttoncontrolled elevator systems diflicultyhas heretofore been experienced in providing a firm contact for thecompletion of the circuit through the reversing and brake magnets owingto the nature of the alternating cur rent. In this device, however, anabsolutely firm contact is obtained, as the contacts completing thecircuit are held together by gravity or other means entirely independentof the alternating current itself. 4

As the cam rotates to the lever which is in its lowermost position itstrikes against the roller 116, lifts the lever 96 toopen thecircuit-closer and restorethe parts to normal. The lever 97 is sobalanced that when toe slips under the arm 107 the said lever will swingto its normal position. (Shown in Fig. 3.) In this position of the partsa certain clearance is left between the lower end of the arm 107 and thetoe 104 to allow free movement of the arm 107 in swinging back to itsnormal position and also to allow the same to swing freely when one ofthe lower magnets is operated and thecam is in the position shown inFig. 1.

In Fig. 7 I have shown a modification of the tripping mechanism. Insteadof a repulsion-magnet, as illustrated in Fig. 3, I employ here analternating-current attrac tion-magnet, but still depend upon gravity orother force for maintaining the circuitclosers in closed position. Thesolenoid 108 has a laminated or longitudinally-slotted core 113 and issupported on the base 99, which is to be secured to annulus 16 of thecontroller-table. The lever 96 is pivoted at 98, its outer end or toe104 being arranged adjacent the lower end of the vertical arm 107 of thebell-crank lever 97, which is pivoted at 105 to a frame 117 ,preferablyof laminated iron. The horizontal arm 106 is constructed of laminatedsoft iron and constitutes an armature for the magnet. The vertical arm107 may be of non-magnetic material and rigidly fastened to the arm 106at 119. The armature 106 is normally held away from the pole of themagnet by means ofthe spring 118, the inward movement of the verticalarm 107 being limitedby the stop 119, which in this instance is anextension of the frame 117. In this position of the lever 96 (shown inFig. 7) the operation of the electromagnetic mechanism has noeffect;-but when the cam 8 is moved away the toe 104 engages the arm107, and then when the armature is attracted the tripping device acts torelease the lever 96 and allow the contacts 100 101 to engage the strips102 103.

Another modification of the tripping mechanism is shown in Fig. 8. HereI employ the principle of the rotary motor. The lields 120. and 121,connected in series, take the place of the solenoids in Figs. 3 and 7.Between the fields and normally out of alinement therewith is a softironarmature 123, pivoted at 122, and held by a spring 124 against a stop125. /Vhen the cam 8 is out of engagement with the roller 116, the toe104 engages the normally vertical arm 107", which is rigid with thearmature 123. Now when alternating current is passed through thefield-coils the armature is drawn into alinement with them against theaction of the spring 124. This effects a tripping of the lever as thearm 107" is moved over the toe 104, and consequently the contacts 100and 101 drop into engagement with the strips 102 and 103, respectively.movable core 238 of a solenoid 108", resting in the recess 239 of anextension of the basepiece 99, is adapted to strike against the arm 106"to trip the lever 96 to circuit-closing position.

The system of circuits connecting the bank I of push-buttons 15 with thecontrolling-magnets will now be described. The number of push-buttons125 to 130, inclusive, in F lg. 1

In Fig. 13 a push-button contact 130.

is proportional to the number of levers 96, and the push-buttonscorrespond to the various floors at which a car or carrier hoist ed bythe motor, as shown in Fig. 4, is desired to be automatically stopped. Asafety push-button 131 is also provided. The pushbuttons may bearranged, if desired, so thatone push-button be placed at each floor.

It will be noticed that the solenoids are electrically connected bymeans of the wire 132, which is connected to the push-button 129 at oneend and to all the insulated con tacts 100 at its other end. Thepush-button contact 129 is also connected by wire 132 with the magnet 9,which is diametrically opposite the magnet 9. The other intermedlatepush-button contacts are in a similar manner connected to diametricallyopposite magnets. The uppermost push-button contact 125is, however,connected by Wire133 only to the magnet 13, and the magnet 13 isconnected by Wire 133 with the lowermost The push-button contact 126 isconnected by wire 134 with magnet 12 and by wire 134 with magnet 12. Thepush-button contact 127 is con nected to magnet 11 by wire 135 and tomagnet 11 by wire 135. So, also, the push-button contact 128 isconnected to magnet 10 by wire 136 and to magnet 10 by wire 136. Thewire 137 is common to thepush-buttons and leads to the normally closedcontacts 133 and 139 of the reversing-switches 3 and 4 and thence to themain 16 of the source of alternating-current supply.

From the main 15 a wire 140leads to a wire 141, which. connects togetherall the insulated contacts 101 on the levers 96. The wires 146 and 147connect the safety-button 131 withthe reversing-switch magnets 74 and75, herein shown as quarter-phase magnets. Single-phase or three-phasemag,

nets could be used, if desired.

With the aid of Fig. 2 the circuits for the reversing-switch magnets(shown in Fig. 1) may be easily. traced. The magnets are shown connectedin' parallel, as they would be if a push-button were operated and thecam 8 did not keep half of the number of levers 96 from falling.Assuming the pushbutton 126 to have been operated, a singlephase circuitwould be established frommain 17 to and through wire 161, wire 132,magnet 12, wire 134, push-button 126,, wire 137, con tacts 138 and139,to the main 16. The ring 112 is thereupon thrown upwardly againstthe disk 109 to effect a tripping of the lever 96. A branch circuit maynow be traced from main 17 to and through wires 132 162-, contacts 100,strip 102, wire 144, coil 157, Fig. 2, coil 153, Wires 160,147, and 146,to the main 16. Also a circuit is established from the main 15 throughthe wires'140 141, contact 101, contact-strip 103', wire 145,magnet-coils 155 and 151, wire 159, to the I to rotate.

1113111116. It is therefore seen that the coils 153 157 are connected ina different phase than the coils 155 and 151, and the current in one setlags ninety degrees behind that of the other if the current-supply istwo-phase. If the cam 8 were in its opposite position, then thereversing-switch magnet 75 would be energized upon operating push-button126.

When the magnet 74 is energized, as explained, it will attract itsarmature 163 and carry the contacts 163, 169, and 170, mounted on thestrips of insulation 172, up against the fixed contacts 165 166 167, thesaidv strip being secured to said armature by means of the rods 171Circuits to the motor will then be established as follows: from main 15to and through contacts 167 170, wire 81, to motor-terminal 85, frommain 16 through contacts 166 169, wire 30, to terminal 86, and from main17 through contacts 165168, wire 79, to terminal 87. At the same timethe brake-magent 40 is energized by a shunt-circuit comprising the wires88, 89, and 90, whereupon the brake 37 is released and the current inthe motor is free to cause the latter At a predetermined point in thetravel of the motor, however, as was explained in connection with Fig.4, the motor is automatically brought to a stop. VVherever theelevator-car happens to be it will be automatically sent to the floorcorresponding to thepush-button 126 and stop at that floor.

In this instance the push-button 126 correshown in such a position thatshows that the car is at its lowermost limit of travel. When the carreaches the second landing, the cam 8 strikes against the roller 116 andlifts the lever 96 corresponding to the magnet 9; but just after itleaves the lowermost landing it releases the lever 96 corresponding tothe magnet 13. When the car leaves the second landing, it releases thelever 96 in alinement with the one it has just lifted. This opera tionis continued at each floor, but has no effect untilthc cam 8 strikes thelever which has been dro ped by operating the push-button 126. Tiislever96 corresponds to that of magnet '12 and when lifted opens thecircuits to the reversing-switch magnet 74 at the contacts 100 101 andcontact-strips 102 103. The reversing-switch 3 will thereupon be openedto break themain-line circuits to the motor 1 and also to thebrake-magnet 40. The brake will therefore be applied and the motorstopped with the car at or near the fifth-floor landing.

It will be seen that when one reversingswitch is operated either thecontacts 138 or 139 are opened, which has the effect of preventinginterference by manipulation of any of the floor-buttons while the caris running and the reversing-switch is in its upperposition. Should itbe desired-to stop the car at any point in its travel without waitingfor it gized to allow the circuits to the motor and brake-magnet tobecome interrupted. Considering at a certain instant of time that thethrough an opening 176 in thecenter of the main 16 is the common return,if the wire 146 is interru ted current can no longer pass through t esolenoids of the magnet 74 from the mains 15 and 17 and no current cantraverse the coils of magnet 75, as the circuits including them arebroken at the controllingboard.

Should the safety-button 131 be operated to stop the car before itreaches the floor to which it has been sent, it will be seen thatalthough the motor may be stopped by holding open the safety-buttonswitch-contacts the motor will again start when the said button isreleased. This is apparent, for the reason that the lever 96corresponding to the fifth floor is left in its lower. position, the cam8 not having reached it to break the reversing-switch-magnet circuitsestablished thereby. To provide against the car from thus-starting upagain when not desired, I arrange in proximityto the inner ends 173 ofthe levers 96 a striking-disk 17 4 for automatically returning the lever96 last operated to its circuit-closing position. This disk 174 issecured to the upper end of a vertical rod 175, which passes downwardlydisk 7 of the controller-table 6. The lower end of this rod 175 passesthrough a guide 180 and rests loosely on the outer end of a horizontallever 176, which is pivoted to a fixed point 17 7. The inner end 179 ofthis horizontal lever is arranged in the path of a collar 178,adjustably secured to the brakerod 94.

A stop 181 is provided to limit the upward movement of the inner end 179of the lever 176, so that the collar may be a short distance above thislever and out of contact therewith when the brake is released. Upon theapplication of the brake, however, the collar 178 will be moved quicklydownward by the spring 41 and will strike a sudden blow against thelever 176. This force will be transmitted to the rod 175, the effect being that the disk 174 will be forcibly thrown upward against the innerends 173 of the levers 96 to restore any one which may be incircuit-closing position.

In Fig. 5 is illustrated electrical means for automatically returning acontroller-boardcircuit-closing lever 96 to its ori inal position. Thesafety-switch 131 is here s own as comprising a lever 201, pivoted at203, and provided with a circuit-closer 199 at its other end,which isadapted to engage the contact 198 or the contact 200. The lever isnormally held by the spring 202 in the position shown; but when thebutton 204 is pressed a circuit is closed from one of the mains, as, 15,to thesolenoid 109 of the restoring-magnet and through the same to wire197, con tacts 200 199, switch-lever .201 to another main, as 16. Inother words, by the operation of the safety-switch the solenoid 109 isconnected in one of the phases and will therefore receive single-phasecurrent. As soon as the circuit is closed current is induced in thecopper ring 112, lying loosely on top of the magnet, and is repelled inan upward direction, being guided by the spool extension or neck 111. Inbeing thus thrown suddenly upward the ring 185 will strike against thelegs 185 of a small table 184, which is preferably composed of fiberorother light and strong material, and force the disk 174 against theinner ends of the levers 96 to restore any one in its closed position toits normal or open position. The

disk 174 is rigidly attached to the table 184 by means ofthe rod 175,which latter is guided in its' upward movement by the guides 182 and183.

If desired, no guides for the rod 175 need be used, but a spider securedto a rod projecting downwardly from the center'of the table 184 into theinterior of the neck 111. In this case the spider-would be continuallyin contact with the inner wall of said neck, and thus keep the rod 175in a vertical and central o sition.

In or er to provide an additional safeguard against any lever 96 beingleft in its closed position when the car stops, I combine automaticcircuit closers with the reversingswitches for the restoring-magnet. Tothe strip of insulation 172 carrying the movable contacts is connectedby the rods 186 187 an additional strip of insulation 188, to which issecured the movable contact 189. The additional strip 188, however, isfree to slide up and down on the rods 186 187 and is supported by thesprings 190 191, which are retained in place by the adjustable nuts 192193. Below the movable contact 189 is a fixed contact 195. Normallythese contacts are separated, the movable contact being supported by thesprings in the position shown 1n Fig. 5. When a reversing-switch hasbeen operated and is then released, the armature and movable contactsdrop until the strip of insulation 172 strikes against the fixed stops194 and 205. The movable contact 189 is made sufficiently heavy so thatit acquires a certain momentum to cause it to continue in its downwardmovement against the action of the springs 190 and 191 and make a firmcontact with the fixed contact-block 195 for a short eriod of time. Acircuit will thus be close from main 15 to and through solenoid 109,wires 197 196,'and

when applied is preferable, however, for in.

that case if the mainline current is cut off and a floor-switch is leftin closed position it will nevertheless be restored, whereas thearrangement shown in Fig. 5 is dependent on the main-line-currcnt supplyfor its operation. In place of the repulsion restoringmagnets attractionrestoring-magnets may be used. i

In Fig. 6 is a modification of the electric restoring means for thefloor-controlling switches. I have..associated with eachreversing-switch magnet (only one being shown for the sake of clearness)an armature 212, which is pivoted at 213 and has a horizontal arm 214secured thereto or integral there'- with. The outer end of thishorizontal arm is provided with a hook which is adapted to coact with acorresponding hook on the end of a rod 207. i This rod is connected to apiston 208 in a dash-pot 209 and is movable through the guide 219. Theupper end of this rod is horizontal, and its bend or knee 218 isnormally in the proximity of the fixed contact 206. IV hen areversing-switch is operated, the armature 212 is drawn toward the rightand the hook 215 engages the hook 217 to effect an upward movement ofthe vertical rod 207. The dash-pot is so constructed that the piston mayeasily be moved upwardly, but is retarded in its downward movement. Thismay be done in various ways well known to those skilled in the art. Inthis instance, by way of example, I have shown twoopenings 220 and 221in the piston 208,-one of said openings being provided with a valve 'onthe under side of the piston to close said opening when the piston movesdownwardly. This piston is made somewhat hfiavy, so that it will restoreitself automatica y;

The operation of the construction shown Fig. 6 1s as follows: 'When thereversingswitch last operated is restored to normal, the arm will fallback to normal position against the stop 223. The rod 207 will beretarded in its downward movement by the dash-pot 209. Therefore uponthe release of the armature the knee 218 will fly to the left andsuddenly make contact with the fixed contact-block 206. The rod 207 maybe so constructed at its upper end to have suffi- 5 cient spring actionto bring the contact 206 and knee 218 into engagement momentarily.

Although this might in some cases be sullicient to cause the ring 112 tobe thrown upwardly to restore the floor-controller switch,

it is preferable by reason of high time con is accomplished by theprovision of the dashpot. The circuit close by the release of the rod207 is from the main 15 to and through the-solenoid 109, wires 197 106,contact 206, knee 218, and rod 207 to point 210, to which is connectedthe main 16. When the armature is attracted, the knee 218 does notengage with contact 206 in its upward movement.

It will be noticed that the current through the floor-controllingmagnets or through the restoring-magnet flows for only a short space oftime, avoiding heating of the magnet-coils and also useless consumptionof current during the operation of the elevator-car. F urthermore, asthe current is on only momentarily either the attraction or therepulsion magnets may be so wound that the applied voltage may be variedwidely without interfering with their normal operation. Thefloor-controller-switch levers may be so nearly balanced that a slightblow from the projected ring is all that would be required to restoresaid levers to their normal positions. The invention combines in onedevice both a fh'ior-controller and floor-mag nets, making thecombination compact, and, furthermore, is so arranged that the operationis absolutely positive in its action.

In the forms outlined the-horizontal controller-table would be securedin position at a convenient place either to the hoistingmotor orseparate from it on its foundation. preferably the former. On thiscontrollertable are mounted the contact-levers, proportioned in numberto the number of landings to be served by the elevator. These leverscould be mounted on separate bases so arranged that by a convenientfastening for securing the lever to'the controller-table the point atwhich the elevator would be brought to rest could be adjusted exactlyafter the elevator-hoisting mechanism and controlling devices were inposition, thus making unnecessary any information beforehand relating tothe distance between floors other than a general knowledge of the Varying heights of the floors.

One form of adjusting means is shown in Fig. 11, in that the position ofthe cam-roller frame 115 may be varied in position circumferentially inthe slot 223 in the lever 96. It is evident that this slot may he madeas long as desired to allow different degrees of adjustingthat is,different distances of travel .for the cam 8 before it strikes theroller116 to lift the contacts 100 and 101 out of engagegagement withthe contact-strips 102 and 103, respectively. From Fig. it is clear thatby loosening the nut 224 on the bolt 225 the frame 115 may be shiftedfrom one position to another and then again secured to the lever 96.

Referring now to Fig. 12 a complete single puslrbutton elevator-controlsystem embodying my invention will be described. This may best be donebv setting forth its operation, as the connections of nearly all theparts have hereinbefore been explained.

Let it therefore be assumed that one of the hall-buttonssay126corresponding to the fifth floor, is operated. A circuit willthereupon be closed through the fifthfioor-controlling magnets 12 and 12in parallel; but only the magnet 12 will be effective in releasing itsfloor-controlling switch-lever 96, as the other lever is held in itslifted position by the cam 8, this cam being in such position that thecar is at the lowermost landing.

The circuit closed by the operation of the button 126 may be traced asfollows! from main 17 to wire 132 and through magnets 12 and 12 inparallel to switch-contact 126 button-contact 126, wire 137,non-interfen ence contacts 138 and 139, wire 226 to another main 16. Themagnet 12 will thereupon operate its tripping mechanism and release itsfloor-controlling switch to closed position. A current will now beestablished through the up reversing-switch magnet as .follows: frommain 17 by wires 16]. and 132 to wire 162, contact 100, contact-strip102, wire 144 to magnet 74, wire 160, limitswitches 227 229, slack-cableswitch 231, wire 232, safety-switch 131, wires 233 234 226 to the main16; also, from main 15 by wire 140 to and through wire 141, contact 101,strip 103, wire 145,,limit-switches 242 and 240, other coils of magnet74, (see Fig. 2,) wire 159 to the main 16. The armature 163 and contactscarried thereby will now be lifted to close the circuits to the motor.In

doing so the contacts 138 are separated, de-

energizing not only the hall-switches and car-switches, but also thecontroller-magnets the travel of the car.

The circuits established to the motor 1 are as follows: from main 15 tofloor-controller limit-switch contact 56 and lever 59, wire 84, contacts76, wire 79 to motor terminal 87, from main 16 to contact 55, lever 58,wire 83, contacts 77, wire 80 to terminal 86, and from main 17 tocontact 54, lever 57, wire 82, contacts 78, wire 81 to the motorterminal'85. Preferably the rotor is connected in circuit with sectionalresistance, which is gradually cut out as the motor increases in speed,or the motor may be so constructed as to start as a repulsion-motor, andtherefore with a large torque and after acquiring a certain speed beautomatically changed to an ordinary lag induction-motor.

The form of motor and'the various ways of starting the same arespecifically no part of my invention, and I deem is unnecessary toillustrate any such devices.

When the up reversing-switch is closed, circuits are also closed throughthe brakemagnet 40 through wires 88, 89, and 90, whereupon the brake 37will be released and the motor will start-in such direction as to causethe car to ascend.

If the car should travel upwardly to its limit of travel, a travelingnut on an eXtension of the hoisting-drum shaft would operate the cam 235to open one of the limitswitches 227. hen the car again descends, theweight 236 would restore the cam to. normal position and thecompressionspring 237 would effect a closure of the opened switch.Should the car run beyond the limits of its travel, the car itself wouldopen one of the additional limit-switches 229 24am 230 243 in thehat'chway. In either casea circuit, including the coils of the reversin-switch ma net 74 would be broken 1 D l whereupon the switch wo'uld dropto open position. In a s milar manner the revers- 1ng-sw1tch would beopened when the cable becomes so slack as to open the slack-cableswitches 231. The efiect of the opening of the reversing-switch'is ofcourse the cutting off of the current tothe motor, the application ofthe brake, and the stopping of the motor.

Additional'switches are mounted adjacent the floor-controller-c-amcylinder to be operated by cams secured to said cylinder when the carruns beyond the desired limits of travel, the result being the breakingof the main lines to the reversing-switch just operated. If desired,these switches may be operated to stop the car at the limits of itstravel.

After the car has been started, as stated, by the operation of thebutton 126 the cam 8 will be rotated until itarrives at the levercorresponding to the fifth floor, when said lever will be lifted and thecontacts 101) and 101 disengaged from the strips 102 and 103. This willcut off the current to the reversingswitch magnet 74 and cause thestopping of the car at the desired landing. At this time the cam haslifted the lever 96 adjacent magnet 12, but has not released thatadjacent magnet 12, so that upon further manipulation of the button 126,although both magnets 12 and 12 are energized, no effect is produced.Upon operation of the button 125 the car may travel to the sixth or topfloor, but can go no farther. The cam 8 wi 1 then hold the upper fivelevers in normal position and only the lower magnets-viz.,'9,

with a bar-.1: ofpush-buttons corresponding to the halLbuttons andconnected in parallel- With them-for instance, the operation of thebutton 126 in the car would have the same effect as the hall-button 126.if the safety- 5 button 131. in the car'should be operated so that thecar would be stop ed between floors, it may be returned to a ower flooror continued to another floor. F or example, if the car should stopbetween the fourth and fifth floors and the restoring-table 174 operatedto bring back the levcr 96 opposite magnet 12 to its original positionthe cam 8 will have released the lever 96 opposite magnet 11.Consequently if the fourth-floor button 127 5 in the car'be operated.the magnet 11 would be effective in opera'tiiig its tripping device andcausing the down reversing-switch to be operated and the motor revolvedin reverse direction to return the can. The cam 8 3 will again lift thelever of magnet 11 as soon as the car reaches the fourth floor, where itwould be stopped.

W thout limiting myself to the precise construction of the details andarrangement of iarts what I claim and desire to secure by Letters Patentof the United St tes, is l. The combination with an electric motor, of arepulsion electroresponsive device,

and motor-controlling means dependent upon 4 a brief action of saidelectroresponsive device for effecting the operation of said motor.

2. The combination with a motor, of repulsion-magnets, and means setinto opera tion by an initial energizatioii of short duration of one ofsaid repulsion-magnets for controlling said motor.

The combination with an alternatingcurrent motor, of repulsion-magnets,and

means controlled by an initial energization of 5 short duration. of anyone of said repulsionmagnets for operating said motor.

4. The combination with a motor, controlling means therefor,'and arepulsion electroresponsive device operated by momentary current tocontrol a single-phase circuit to said'motor-coiitrolling means.

, 5. The combination with an alternating current motor, controllingmeans; therefor,-

and single-phase repulsion-magnets set into action by brief currents'foroperating said.

controlling means; Q I.

6. The combination with a 'multiphase motor, of controlling meanstherefor, a repulsion-magnet, and means in a circuit connected acrossany two of the mains of said .motor-and controlled by said magnet forclosing circuits to said inotor-controlling means. I

7. The combination with an alternatingcurrent motor, of controllingmeans tliere for, a repiilsion elcctroresponsive device connected in asingle-phase circuit to mains of said motor, and means for closing acircuit to said electroresponsive device to effect the operation of saidcontrolling means.

8. The combination with a motor, of a controller-board,repulsion-magnets mounted on said controller-hoard, and means operatedby said repulsio11-1nagnets for effecting the closure of themotor-circuit and the maintaining of same in firmly-closed position tocontrol said motor.

9. The combination with a motor, of reversing-switches therefor,repulsion-magnets,

cuit-closer and the operation of said motor,

11. The combination with a motor, of motor-controlling means, a normallyopen circuitcloser, a tripping device, an electromagnet for operatingsaid tripping device to effect the closure of said circuitcloserby,gravity, circuits and connections between said circuitcloser andmotor-controlling means, and means independent of current beingmaintained in the main line for automatically restoring saidcircuit-closer to normal position.

12. The combination with a motor, of reversing-switches, acontrollcnboard, a plurality of repulsionelectromagncts on saidcontroller-board, a plurality of normally open circuit-closers on saidboard, a plurality of tripping devices operable by said electromagnetsto effect the automatic closure of said circuit-closers, and circuitsand connections for starting themotor upon the closure of any onecircuit-closer. i

13. The combination with a iiiotor, of motor-controlling means, acircular board, a series'of radially-arranged circuit-closers, trippingdevices normally holding said circuitclosers in open position, a seriesof circularly-arranged electromagnets for opera-ting saidtripping'dcvices. to release said circuitclosers to closed position, andcircuits and connections between said circuit-closers and saidmotor-controlling means.

14. The combination with a'motor, of motor-controlling means, acircuit-closer, means.

for normally holding saidcircuit-closer in open position, anelectromagnet for actuatmg said holding means to release said 01rtonormal position.

,cu1tclosers, single-phase repulsion-magnets gle-phase .closer, circuitsand connections between said circuit closer and said motor controllingbrake mechanism operates to stop the motor.

cuitcloser, circuits and connections be-l trolling means, and meansindependent of current being maintained in the main line forautomatically restoring said circuit-closer 15. The combination with analternatingcurrent motor, of motor-controlling means, a circuit-closer,means for normally holding said circuit-closer in open position, arepulsion-electromagnet for actuating said hold- I ing means to releasesaid circuit-closer, circuits and connections between said circuitcloserand said motor-controlling means, and mechanical means for automaticallyrestoring said circuit-closer to normal position.

16. The combination with a motor, of motor-controlling means, acircuit-closer, means for normally holding said circuitcloser in openposition, anelectromagnet for actuating said holding means to releasesaid circuitmeans, and means for automatically restoring saidcircuit-closer to normal position upon the stopping of the motor.

17. The combination with a motor, of reversing-switches therefor, brakemechanism, a circuit-closer, means for normally'holding saidcircuit-closer in open position, means for tripping said holding meansto effect the closure of said circuit-closer, circuits and con--nections between said circuit-closer and said reversin -switches, andmeans actuated by said brailie mechanism to restore said circuit-closerto normal position when said 18. The combination with a motor, ofreversing-switches for said motor; multiphase circuits for saidreversing-switches, circuitclosers, and single-phase magnets for,operating said circuit-closers to close said multi-. phase circuits.

19. The combination with an alternating: current motor, ofreversingswitches, cirfor effecting the operation of saidcircuitclosers, and circuits and connections between said circuitclosers and said reversingswitches.

20. The combination with a polyphase motor, of reversing-switches,circuit-closers, sin- -electromagnets for efiecting the closure of saidcircuit closers, and multil phase circuits and connections for saidcircuit-closers and the reversing-switches. 21'. The combination with amotor, of mol tor-controlling means, a circuit closing lever, i meansfor holding said lever normally in] open osition, an electromagnet foroperat ing said'holding means to effect the closure of i the circuitscontrolled by said circuit-closing i lever, and a cam for automaticallrestoring said lever to normal position at wi l. v 22. The combinationwith a motor; of mo- 1 magnets for tor-controlling means; a plurality ofradiallyarranged. circuitclosing levers; means .for normally holdingsaid levers in open position, a plurality of circularly-arrangedelectromagnets for operating said holding means to trip said levers toclosed position; circuits and connections for said motor-controllingmeans,

said circuit-closing levers; and said trippingelectromagnets, and anarc-shapedcam for restoring said levers and holding-means to normalposition. i

23. The combination with a polyphase motor, of motor-controlling means,radially-ar-- ranged circuit-closing levers, .means for normally holdingsaid levers in open position, electromagnets for operating said holdingmeans to trip said levers to closed position,

multiphase circuits and connections for said reversing-switches,single-phase circuits and connections-for said .electromagnets, and anarc-shaped cam for restorlng said levers to normal position. 24;. 'Thecomb'nationwith a motor, of motor controlling means, a table providedwith a circular slot dividing said table into an inner disk and an outerannulus, a plurality of arc-shaped contact-strips mounted on the disk, aplurality of radially-arranged levers,

contacts carried by said levers to cooperate with said contact-strips,means for normally holding said levers in raised position with theircontacts out of engagement with the contact-strips, a plurality ofcircularly-ar ranged electromagnets for operating said holding means totrip said levers and effect the engagement of said contacts and strips,circuits and connections for the aforementioned elements, and anarc-shaped cam movable in said circular slot for restoring said leversand holding means to normal position.

25. The combination with a motor, of motor-controlling means, a luralityof circuitclosers, means for norma ly holding said circuit-closers inopen osition, electromagnets for actuating said ho ding means to effectthe closure of said circuit-closers, circuits and connections betweensaid circuit-closers and motor-controlling means, .brake mechanism,

and means operable by said brake mechanis'm for positively actuatingsaid circuitclosers to restore the same to normal position. 26. Thecombination with a motor, of motor-controlling means, circuit-closinglevers,

circuits and connections between-said levers 1 and saidmotor-controlling means, means for holding said levers in open position,electroreleasing said holding means brake mechanism and-means coactingwith said brake mechanism 'for'restoring said levers to open position.

' 27. The combination with a motor, of con- IIO trolling means therefor,a table, a plurality of radially arranged circuit closing levers lmounted on said table, circuits and connecating the inner ends of saidlevers to restore tions for said motor-controlling means and saidlevers, means for holding said levers in open position, electromagnetsfor releasing said holding means, means extending through an opening insaid table for positively actusaid circuits and connections permittingthe Y tor-controlling means, a

closure of only one circuit-closer at a time.

29. 'The combination with a polyphase motor, of motor-controlling ofcircuit-closers, means or holding said circuit-closers in open position,single-phase electromagnets for releasing said holding means, circuitsand connections, means coacting with said circuits and connections forpermitting the closure of only one circuitcloser at a time, brakemechanism for the motor, and means coactingwith said brake mechanism forautomatically restoring the closed circuit-closer to open position.

30. The combination with a motor,oi" moplurality of radiallyarrangedcircuit-closing levers, electromagnetic mechanism for efiecting aclosure of the circui ts controlled by said levers, circuits andconnections. between said levers and motor controlling means, meansfor-preventing the operation of more than one circuit-closing lever at atime to closed position, and adjustable means for restoring the operatedlever after the motor has made a predetermined number of revolutions.

31. The combination with a motor, of motor-controlling means, aplurality of circuit- 1closers, electromagnetic mechanism foroperating'said circuitclosers,circuits and connections between saidcircuit-closers and said motor-controlling means, means coact ing withsaidcircuits and connections for permitting the closure of only onecircuitcloser atja time, means" for restoring'"' the closedcircuit-closer upon the motor complet-. ing a predetermined number ofrevolutions,.

and means for adj ustingsaid-resto 'ing-means to vary said number'ofrevolutions. Y

32.} The combination with a motonof controlling means therefor,main-line circuits and connections 'forsaid 'motor'con trolling- -meansa cylinder'rotatably and positively connected to the motorrshaft,limit-[switches in said main-line circuits, and cams carried by saidcylinder to opensaid switches to stop the motor after the same has madea predetermined number of revolutio said restoring means, a pluralitytor system including said 33. The combination with an alternatingcurrent motor, of motor-controlling means, polyphase circuits for saidmotor-controlling means, and circuits and connections .of a single,push-button-controlled elevator system comprising a floor-controller andsinglephase magnets for operatingthe same.

I 34. The combination with a multiphase motor; of -motor-controllingmeans; multiphase circuits for said' motor-controlling controller, andmeanscontrolled from the car or from a landing and operated bycurrent'of short duration for setting said floorcontroller, so that thecar shall automatically stop at a'predetermined point in its travel.

36. The combination with a car, of hoisting mechanism therefor, a motorfor operating said hoisting mechanism, motor-controlling means, afloor-controller, means operated by current of short duration forsetting and locking said floor-controller from a distant point,

and circuits and connections for effecting the starting" of said motorupon the setting of said floor-controller, and means for restoring saidfloor-controller to normal upon the car reaching the selected point inits travel.

37. The combination witha car and its motor, of motor controlling means,a floorcontroller, circuits and connections of an automatic push buttoncontrolled elevator system for eflecting the setting of thefloorc'ontroller upon the operation of one of the push-buttons, -meansfor preventin intererencerby any floor push-button aiter one button hasbeen operated, and means for automatically restoring saidfloor-controller to normal upon the car reaching the-selected 1 floor.

38. The combination with'a car and its I motor, of reversing-switchesfor said motor,

a floor-controller comprising repulsion-electromagnets, clrcuits andconnections for said floor-controller, and means coacting with saidreversmg-smtches for rendering said repul sion-magnets inoperative.

39. The combination with a car and its motor, of motor-controllingmeans, a floorcontroller comprising singlebase repulsionelectromagnets,circuitsan connections of an automatic -pushbutton-controlled elevaandmeans coacting with said motor-controlling means for. preventingv acircuit from being com leted, through any of said electromagnetsuringthe operation of the motor.

40. The combination'with a car, of a mul tiphase motor,reversing-switches for said motor; multiphase circuits for said motorfloor-controller,

and reversing-switches, limit-switches, means I for operating saidlimit-switches to efiect the automatic stopping of the car at the limitsof its travel, afloor-controller comprising single- I phaserepulsion-electromagnets, circuits and connections of an automaticpush-buttonl controlled elevator system including said floor-controller,-means coacting with said reversing-switches for rendering saidrepulsion-Inagnets inoperative during the travel of

